#include <stdio.h>

int main(void) {
int a[]={3,5,2,4,1,9,7,6,0,8};
int max1=a[0],pos1=0;
int max2=-1,pos2=-1;
int i,sum=0;
double ave=0.0;
for(i=0;i<10;i++){
sum+=a[i];
if(a[i]>max1){
	max2=max1;
	pos2=pos1;
	max1=a[i];
	pos1=i;
}
else if(a[i]>max2){
	max2=a[i];
	pos2=i;
}
}
ave=sum/10;
printf("最大値:%d,場所:%d\n",max1,pos1);
printf("二番目に大きい数:%d,場所:%d\n",max2,pos2);
printf("平均値:%lf\n",ave);

	return 0;
}